Description
GE General Electric Technical Specifications: IS200ISRJG1AAA
Applications with generators operated in parallel and IS200ISRJG1AAA grounded through a common impedance require special consider
ations. If only one generator is grounded and the other ones left floating, the directional element for the floating generators
does not receive a correct Vneutral signal and therefore cannot operate correctly. In those applications, the element makes
use of auxiliary contacts off the grounding switch IS200ISRJG1AAA and the unit breaker to turn the element into a simple overcurrent element,
with the pickup level set for the directional element (note that the ground directional element and the ground overcurrent
elements are totally separate elements). In this mode, the element can retain a high sensitivity and fast operate time since
it will only respond to internal stator ground faults. The table below illustrates the status of different elements under various
operating conditions.
brand | Product Name | Product model | Order No |
GE Fanuc | Module card | IS200ISRJG1AAA | nothing |
Place of Origin | Marketable land | Imported or not | defects liability period |
Europe and America | Nationwide and overseas | yes | a year |
Place of shipment | Delivery method | How to use | Applicable industries |
Xiamen | Shunfeng Express | Commissioning and installation | Power Plant Steel Plant Cement Plant Shipboard Papermaking |
Service advantages | Foreign import, goods preparation and supply | Reasonable price and reliable quality | Pictures are for reference only |
Product features | Primary source of goods, supply by model | After sales guarantee | Chen 1810693-7731 |
The conventional IS200ISRJG1AAA neutral overvoltage element or the ground overcurrent element are not capable of reliably detecting stator
ground faults in the bottom 5% of the stator, due to lack of sensitivity. In order to provide reliable coverage for the bottom
part of the stator, protective elements, utilizing the third harmonic voltage signals in the neutral and at the generator output
terminals, have been developed [4].
In the 489 relay, the third-harmonic voltage element, Neutral Undervoltage (3rd Harmonic) derives the IS200ISRJG1AAA third harmonic com
ponent of the neutral-point voltage signal from the
Vneutral signal as one signal, called VN3. The third harmonic component
of the internally summed phase-voltage signals is derived as the second signal, called VP3. For this element to perform as
originally intended, it is necessary to use wye-connected VTs
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